Megger TTR25-1 Transformer Turn Ratio Test Set

The TTR25 Handheld TTR Test Set is a fully automatic, self-checking, self-calibrating unit. The test set measures the turn ratio, excitation current, and phase displacement (polarity) of single- and three-phase (phase by phase) distribution transformers, as well as power, potential and current transformers. The TTR25 Handheld TTR Test Set is powered by six AA-size replaceable alkaline batteries. The test set is a portable instrument housed in a sturdy plastic case. A carrying case with strap and an accessory pouch is provided with the test set. The test set can be used to test single-phase and three-phase transformers, both with and without taps in accordance with the requirements of the IEEE C57.12.90 - 1997 standards. For three-phase transformers, the test set is connected to each of the three phases of the transformer to be tested, and measurements are made on a phase by phase basis. Turn ratio, phase displacement (polarity), and excitation current are displayed on a large LCD. Transformer excitation current helps to detect transformer shorted turns or an unequal number of turns connected in parallel. Operating condition (error) messages identify incorrect test connections, abnormal operating condition, or winding problems. Test results can be printed out on an optional printer. FEATURES Fully automatic operation. Self-checking at power-up. Self-calibration at each measurement. User-friendly, one button operation. Test turn ratio, excitation current, and phase displacement (polarity). Easy measuring of single and three phase (phase by phase) transformers. Checking reverse test lead or winding connections at start of each test. External optional printer records test data. Three automatically selected excitation test voltages: 8 V, 1.5 V, and 0.5 V. Choice of seven languages. Large, easy-to-read LCD shows alphanumeric data. Meets the requirements of both the European EMC and Low Voltage Directives (CE mark). Trouble-free operation in switchyards under electrostatic and magnetic interference conditions. Megger TTR25-1 Specifications Excitation Voltage 8 V rms for testing distribution or power transformers and PTs; 0.5, 1.5, or 8 V ac rms for testing CTs. Test Frequency 55 Hz internally generated providing a universal 50/60 Hz test set. Excitation Current Range 0 to 100 mA, 4-digit resolution. Turns Ratio Range 0.8 to 20,000, 5 digit resolution. Transformer Polarity Normal or reversed. Current (rms) Accuracy 5% rdg +0.5 mA. Turns Ratio Accuracy* 0.20% (0.8 to 4,000) 0.25% (4,001 to 10,000) 0.30% (10,001 to 20,000) *For Excitation Current Values no greater than preset value. Display Full Graphics LCD module, adjustable back-lighting, wide temperature range, 128 x 64 dots (21 characters by 8 lines). Safety/EMC/Vibration Meets the requirements of IEC-61010, CE and ASTM D999.75. Temperature Range Operating: -20° C to 55° C (-5° F to 130° F) Storage: -50° C to 60° C (-55° F to 140° F). Protective Devices High voltage side shorting relay, transient voltage suppressors and gas surge voltage protectors. Measuring Time Less than 5 seconds. Measurement Method ANSI/IEEE C57.12.90 and IEC 600076.1 (2000). Type of Power Six standard “AA” (IEC LR-6) alkaline batteries. Battery Life Up to 12 hours of field operation. Dimensions 240 H x 115 W x 50 D mm (9.5 H x 4.5 W x 1.9 D in.). Weight Approximately 1.3 kg (2.8 lb), including leads. Megger TTR25-1 Warranty 1 year.

For more information on Megger TTR25-1 Transformer Turn Ratio Test Set talk to Cuthbertson Laird Group